pydata / pandas-datareader / 700

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Replace Yahoo iCharts API (#355)

* Replaces ichart API for single-stock price exports from Yahoo, multi-stock still failing (#315)

Restores change necessary for Google to function
Fixes yahoo-actions per API endpoint update
Update regex pattern for crumbs, per heyuhere's review
'v' is no longer a valid interval value
Fixes Yahoo intervals and cases where the Yahoo cookie could not be extracted.
Implements multi-stock queries to Yahoo API
Adds a pause multiplier for subsequent requests from Yahoo, error handling for empty data requests, and updates some test logic for pandas 0.20.x (notably ix deprecation)
Check object type before checking contents
Replacement regex logic for additional Yahoo cookie token structures, per chris-b1
Improved error handling and refactoring test to best practices, per jreback review.

closes #315

* better error handling after get_response

* docs for 0.5.0

* remove deprecation warnings: ix usage -> loc/iloc
remove deprecation warnings: sortlevel usage -> sort_index

* more resource cleaning

* update changelog

* skip enigma tests locally if no api key

* fixturize test_yahoo_options

* add in test.sh script

* CI: use trusty dist

256 of 256 new or added lines in 17 files covered. (100.0%)

2039 of 2384 relevant lines covered (85.53%)

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